Well reamer



Jan. 3, 1928. 1,654,609

F. L. SCOTT ETAL WELL BEAMER Filed Jun 11. 1925 F/'yfi ny@ gwn/row Patented Jan. 3, 1928".

UNITED STATES PATENT OFFICE.

FLOYD L. SCOTT AND RALPH NEUHAUS, Fy HOUSTON, TXAS, ASSIGN ORS TO HUGHES TOOL COMPANY, OF HOUSTON, TEXAS, A CORPORATION TEXAS.

WELL REAMER.

Application led June 11, 1925. Serial No. 36,540.-

Our invention relates to well reaniers.` It finds application in well drilling and serves to preserve the size ot' the hole beingdrilled.

It is an object of the invention to provide :i torni ot' construction tor well reamers which will be cheap and economical to manu. 'facture and easy and simple to assemble. It is desired to make the tool of a minimum number ctl parts,A which may be assembled l0 :1nd again taken apart with as small a consumption of time as possible.

Referring to the drawing herewith, Fig. l is a side view partly in elevation and partly in central longitudinal section. Fig. Q is a transverse section through Fig. 1 on the plane 2 2 showingone of the sets .of reaming cutters removed. Figs. 3 and 4 are side and end elevations respectively of the locking` block used to secure the cutter pins in position. Figs. 5 and 'are side and end views respectively of the removable bearing member. Like numerals of reference are employed to designate likeparts in all the views.

'25 In carrying out vour invention it is desired to make the device strong and substantial, butsimple in construction. We therefore employ a tubular head l, whichlis adapted to `act as a drill collar as well as a body for so the reamer. Its upper end may therefore bethreaded internally with a tine threadvat 2 for attachment tofa'section of pipe ordrill stem. Its lower end has an outwardly flaringsocket 3 coarsely threaded to receive the shank of a drill bit. v

The body of the reamer is preferably somewhat elongated so as to enable the rea-mer to act as a guide to hold the drill straight in the hole and thereby'avoid drilling a crooked hole. One or more stages o rolling cutters ma be employed and We have shown two. hese cutters are arranged in vertical alignment in sets of three. Each cutter is mounted in a radial recess 4, in the side of the head and is preferably in two parts-or sections. The upper section `5 is tapered at its upper end but is otherwise Aof cylindrical outline toothed at 7 to cut the slde of the hole. The lower section 6 1s cylindrical` and toothed. The said sections are mounted rotatably upon an upright bearing.'

pin 8 the ends of which arereduced slightly in diameter.- The upper reduced end fits with a socket or recess bored in the upper wall of the recess 4 to receive it.' It is held non-rotatably therein by means of a transverse pin 1() extending' through the socket 9 as shown. The lower set of cutters is set in its recess 4^ in the same manner as in the case of the upper set except that the tapered section is presented downwardly. The pin 11 is set at its lowerend in a socket 9 and has a transverse pin 10 therethrough.-

The adjacent ends of the two cutter pins 8 and 11 are secured removably in position by bearing blocks, 12, 12 fitting against the inner sides ot' the upper andlower pins respectively. These bearing blocks are arcuate in shape, as shown in Fig. 6 and have a recess 14 on the outer side to receive the re'- duced end otl its bearing pin. The locking block 15 i's adapted 'to t between the two bearing blocks 12,12'. It has its inner face rounded to `fit said recess 4, but isspaced normally from the walls of the recess a slight distance to give the block a radial adjustment. The block 15 has upper and lower longitudinal extensions 16 litting about the adjacent ends of the pins 8 and 11 to hold them in operative position. The locking block is clamped tightly a-gainstthe cutter pms by `set screws 17, which are set at any angle to each other diverging inwardly for engagement in the body of the reamer. l y

It will be noted that the radial recesses 4 and 4 constitute what is in fact one recessA which may be formed-in the body'of the reamer. The cutters may be assembled in position by placing thecutter sections upon their bearing pins, as shown. Bearing washers at the endsof the cutters may be employed asshown at 18. The outer ends ofthe pins are then engaged in their sockets 9 and 9 andthe bearing blocks 12, 12 placed in position. The locking block 15 is then inserted in position and clamped firmly in locked position against the ends of the pins by the set screws 17. The .pressure of the locking block on the 'cutter' pins Serves to assist in preventing rotation of the pins.

It` will be obvious that a reamer thus formed will. be simple and economical to manufacture and'will be easy to assemble. The cutters may be changed or repaired without removing the reamer from the drill stem or drill.

v Having thus described our invention what we claim as new is:

1. A reamer comprising a unitary tubular body threaded at its ends for engagement to the drill stem and the drill, said body having radial recesses in the sides thereof, upy per and lower cutters in each of said recesses, bearing pins for said cutters, bearing blocks Jfor the adjacent ends of said pins, and a locking block fitting between said bearing blocks and having means thereon engaging the ends of said pins to clamp them nonrotatably in their bearings.

2. A reamer comprising a tubular body having its ends internally threadedr said body having a plurality of longitudinal radial recesses therein, upper and lower bearing pins in each said recess, removable bearing'bloclrs for the adjacent ends of said pins, a locking block shaped to `tit between said bearing blocks and clampingly engage the said adjacent ends of said pins, and cutters on said pins.

3. A reamer comprising a. tubular body adapted for attachment to a drill stem, said body having radial recesses therein, upper and lower cutter pins having their remote ends received in sockets in the ends of said recess, removable means to clamp the adjacent ends of said pins in position, and cutters rotatable on said pins. Y

4. A reamer comprising a tubular body, a

plurality of cutter pins mounted in vertical alignment in recesses in the sides of said body, the adjacent ends of said pins having removable bearing blocks locking blocks between said bearing bloclrs, means on said blocks to clamp the adjacent ends of said pins, and roller cutters on said pins.

5. A reamer comprising an approximately cylindrical body with longitudinal recesses in its outer face, cach recess adapted to receive av plurality of cutters, cutter pins mounted in each of said recesses, the upper most and the lowermost of said cutter pins having their remote ends received in the walls of said recesses, cutters on said pins and detachable means to clamp the adjacent ends of said pins in non-rotatable position.

6. In a. reamer having roller cutters mounted upon cutter pinsarranged in Vertical stages theren, the improvement comprising a removable locking block secured in position between the adjacent ends of the cutter'pins, and adapted to secure them in operative position.

In testimony whereof, we hereunto affix our signatures, this the 26th day of May, A. D., i925.

FLOYD L. SCOTT. RALPH NEUHAUS. 

